FLAC 1.1.3 has been released. Almost 2 years in the making, FLAC 1.1.3 is a major release with improved compression, improved cover art and multichannel support, better recovery for corrupted files, many new features and options in the command-line tools, and several bug fixes. For developers, the decoder and encoder APIs have also been simplified and there is a new porting guide. See the changelog entry for complete details.

No, it's more than 6 bytes. I tried to encode a few files on my german system and the compression stays the same (or almost the same) as in 1.1.2. I would say that this [-A "tukey(0,5)"] parameter is the main difference between the 1.1.2 and 1.1.3 encoder.